Fetch Execute Cycle

Question 1

Four registers are used within the fetch-execute cycle. Define a Register.

Answer 1

A register is a high speed memory location used for specific purposes where data or control information is temporarily stored.

Question 2

What is PC

Answer 2

Program Counter
Holds the address of the first instruction of the cycle. More addresses added after each instruction.

Question 3

What is MAR

Answer 3

Memory Address Register
Remembers the address of the instruction to be fetched

Question 4

What is MDR

Answer 4

Memory Data Register
Temporarily holds the data when instructions are being fetched

Question 5

What is CIR

Answer 5

Current Instruction Register
Instruction Register holds the current instructions to be executed.